CN110079323A - A kind of arsenic, nickel combined pollution place soil remediation stabilizer and its processing method - Google Patents
A kind of arsenic, nickel combined pollution place soil remediation stabilizer and its processing method Download PDFInfo
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- CN110079323A CN110079323A CN201910365200.XA CN201910365200A CN110079323A CN 110079323 A CN110079323 A CN 110079323A CN 201910365200 A CN201910365200 A CN 201910365200A CN 110079323 A CN110079323 A CN 110079323A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
- C09K17/06—Calcium compounds, e.g. lime
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a kind of arsenic, nickel combined pollution place soil remediation stabilizer and its processing methods, including following component and its proportion: content is ferrous sulfate solution, calcium hydroxide solution and the water of 5 wt%, and ferrous sulfate is FeSO in ferrous sulfate solution4•7H2O, ferrous sulfate solution volume and contaminated soil mass ratio to be processed are 0.3:100-0.5:100, and the calcium hydroxide solution amount of addition is to ensure that the pH of contaminated soil to be processed is 6-8, and the water of addition ensures that soil moisture content is 35-45%.Ferrous sulfate cooperation calcium hydroxide of the present invention adjusts pH and handles arsenic, nickel contamination contaminated soil of site, not only reduces cost, but also preparation and application is simple.Compared to other methods, effect is more preferable, compares with the medicament of other same effect on the market, ferrous sulfate cost, which can decline, can reach 300% or more, be applied using aqua, and medicament contacts more abundant with soil, the maintenance processing time shortens 2/3, and sufficiently reacts, better processing effect.
Description
Technical field
The invention belongs to arsenic, nickel combined pollution place soil processing technology field, it is related to a kind of arsenic, nickel combined pollution place
The preparation and application of soil remediation stabilizer.
Background technique
In recent years, the environmental pollution as caused by heavy metal and its health hazard have attracted extensive attention.Arsenic (As) conduct
One of " five poisonous creatures: scorpion, viper, centipede, house lizard, toad element " (mercury, cadmium, lead, chromium, arsenic), environmental hazard and healthy and safe is especially taken seriously.In natural environment
Geochemical process and mankind's activity, such as metallurgy, industrial wastewater discharge, pesticide, result in soil and groundwater jointly
Arsenic concentration increasingly increases.
Arsenic (As) is the strong carcinogen to human body and the toxic effect of animal, is more universal soil pollutant.Soil
Arsenic element in earth mainly exists with inorganic states, mainly there is+3 and+5 two kinds of valence states, when the pH of the soil liquid be 4~8 when, often with
The anion acid group form such as H3AsO3, H2AsO4 or HAsO42- exists.A part of arsenic is rigidly mounted soil in soil
In, and another part can then be desorbed from soil constitution and be migrated with the soil liquid, be easy to be bioavailable and migrate leaching
It loses, causes environmental hazard.
Metallic nickel is almost without acute toxicity, and general nickel salt toxicity is relatively low, but carbonyl nickel can generate very strong poison
Property.Nickel in natural water is often dissolved in the form of halide, nitrate, sulfate and certain inorganic and organic complex
Water.Soluble ion in water can form hydrated ion (Ni (H2O) 6) 2+ in conjunction with water, with amino acid, cystine, fulvic acid
Deng the soluble organic complex ion of formation, they can be migrated with water flow.The migration of nickel in water, mainly formed precipitating and it is coprecipitated
It forms sediment and is migrated in crystalline form deposit to substrate, the nickel of this migration accounts for the 80% of gross migration altogether；Dissolve form and solid
The migration of absorption shape only accounts for 5%.For this purpose, the nickel in water body is largely all enriched in Sediments, deposit nickel content
It is 38000~92000 times of nickel content in water up to 18~47ppm.Nickel in soil is mainly derived from rock weathering, atmosphere
Depositing dust, irrigation water (including nickel-containing waste water), farmland fertilization, plant and animal remains rot etc..Plant growth and farmland row
Water can take away nickel from soil again.It is inhaled in general, instructing inorganic and organic complex by soil with the nickel ion that dirty filling enters soil
Attached, main accumulation is on surface layer.
Common arsenic, nickel contamination soil restoring technology mainly have curing/stabilizing technology, vitrification, Soil leaching
Technology, electric repairing technique and bioremediation technology etc. in situ, wherein energy consumption is high for vitrification, at high cost；Soil leaching skill
Art investment is big, and soil nutrient is easily caused to be lost or precipitate；Electric repairing technique in situ requires strictly soil types, and still
In the incipient stage；Bioremediation technology requires height to soil, and time-consuming, easily causes secondary pollution.And stabilization technology can have
Effect, economic, the rapidly available state arsenic in stable soil, and application is wider, technology maturation.
For the repairing and treating of heavy-metal contaminated soil, stabilization technology is a kind of more mature and cost-effective skill
Art.Using stabilizer and soil and heavy metal therein hydration reaction, redox, chelating, precipitating, absorption etc. occur for the technology
Physics chemical action, by changing the chemical form of heavy metal in soil or reducing its migration, to reach repairing and treating
Effect.So far, have nearly thousand heavy-metal contaminated soil rehablitation projects in American-European and other developed countries and use stabilisation
Technology.
The core of Stabilization Remediation Technology is to select a kind of economic and effective and safe stabilization agent.Closest to now
Have in technology, patent of invention (CN101695711B) discloses a kind of chemical fixing material suitable for arsenic in soil, with nanometer two
Raw material is wanted based on titanium oxide, zeroth order iron powder, there is a problem of in use at high cost.Patent of invention (CN101879521A) is open
Soil pH basic matterial is adjusted to pH8~10, is added at molysite by a kind of administering method of As polluted soil
Reason, this method are unfavorable for soil post-processing and use due to changing soil pH.The open one kind of patent of invention (CN102233354A) is repaired
The processing method of multiple As polluted soil, the method preparation activation red mud solid stabilizer activated using molysite and ferrous salt, due to red mud
In contain lot of trace radioactive substance and strong basicity chemical substance, will lead to the secondary pollution of soil.Patent of invention
(CN102974601A) disclose a kind of method of As polluted soil stabilizer and repairing polluted soil, by montmorillonite, calcium oxide,
Magnesium carbonate, iron filings prepare stabilizer as raw material, in use since calcium oxide is added, change soil pH, after being unfavorable for soil
Processing uses.The improvement stabilizer containing As polluted soil is disclosed there are also some other patent of invention, but it is not multiple to arsenic, nickel
The case where closing pollution carries out research explanation, and often ingredient is various, and preparation process is complicated, and application method is also more troublesome, nothing
Method meets the needs of waste treatment project.
Summary of the invention
The technical problem to be solved by the present invention is provide a kind of arsenic, nickel combined pollution place soil remediation stabilizer and its
Processing method, to solve problems of the prior art.
The technical scheme adopted by the invention is as follows: a kind of arsenic, nickel combined pollution place soil remediation stabilizer, including below at
Divide and its match: content is ferrous sulfate solution, calcium hydroxide solution and the water of 5wt%, ferrous sulfate in ferrous sulfate solution
For FeSO4·7H2O, ferrous sulfate solution volume and contaminated soil mass ratio to be processed are 0.3:100-0.5:100, addition
Calcium hydroxide solution amount is to ensure that the pH of contaminated soil to be processed is 6-8, and the water of addition ensures that soil moisture content is 35-
45%.
A kind of processing method of arsenic, nickel combined pollution place soil remediation stabilizer, method includes the following steps:
(1) FeSO is prepared4·7H2O content is the ferrous sulfate solution of 5wt%；
(2) contaminated soil to be processed removes large-sized stone and other sundries (is planted by preliminary broken and screening process
The residual branch of object, weeds, rubbish etc.), it is ensured that partial size is no more than 20mm, and the step of matching is added according to contaminated soil quality to be processed
(1) FeSO in4·7H2O solution；
(3) pH size and amount of water, the calcium hydroxide of addition are determined according to the initial pH of contaminated soil to be processed and moisture content
Amount of solution is to ensure that the pH of contaminated soil to be processed is 6-8, makes the final moisture content 35-45% of contaminated soil to be processed；
(4) 5-15min of mechanical stirring is sufficiently mixed ferrous sulfate solution with contaminated soil to be processed；
(5) soil natural conserves 1 day after oxidation processes.
Beneficial effects of the present invention: compared with prior art, ferrous sulfate of the present invention cooperation calcium hydroxide adjust pH and
It adjusts moisture content and handles arsenic, nickel contamination contaminated soil of site, not only reduce cost, but also preparation and application is simple.This is steady
Determine agent to be mixed with arsenic, nickel contamination place soil, to repair contaminated soil, for a kind of economical and effective and is very suitable to work
The stabilizer for repairing arsenic, nickel combined contamination soil of Cheng Yunyong, compares other methods, and effect is more preferable, and other same on the market
The medicament of effect compares, and ferrous sulfate cost is 300 yuan/ton, and cost, which can decline, can reach 300% or more, be applied using aqua
Add, medicament contacts more abundant with soil, and the maintenance processing time shortens 2/3, and sufficiently reacts, better processing effect passes through
Test arsenic, nickel leaching rate is respectively less than and repairs target.
Detailed description of the invention
Fig. 1 is the stabilization effect figure of ferrous sulfate (a) and iron chloride (b) to As contaminated soil；
Fig. 2 is influence diagram of the ferrous sulfate dosage to As stabilization effect and soil pH；
Fig. 3 is the Traits change figure of different amount of water Soil Under Conditions；
Fig. 4 is influence diagram of the amount of water to As stabilization effect and soil pH；
Fig. 5 is influence diagram of the soil pH to As stability.
Specific embodiment
With reference to the accompanying drawing and invention is described further in specific embodiment.
Embodiment 1: a kind of arsenic, nickel combined pollution place soil remediation stabilizer, including following component and its proportion: content
For the ferrous sulfate solution, calcium hydroxide solution and water of 5wt%, ferrous sulfate is FeSO in ferrous sulfate solution4·7H2O, arsenic,
The contaminated soil quality to be processed in nickel combined pollution place is 100kg, and ferrous sulfate solution quality is 0.3kg, the hydrogen-oxygen of addition
Changing calcium solution ensures that the pH of contaminated soil to be processed is 6, and the water of addition ensures that contaminated soil moisture content to be processed is 35%；
Using the processing method of a kind of above-mentioned arsenic, nickel combined pollution place soil remediation stabilizer, this method includes following
Step:
(1) FeSO is prepared4·7H2O content is the ferrous sulfate solution of 5wt%；
(2) contaminated soil to be processed removes large-sized stone and other sundries, really by preliminary broken and screening process
It protects partial size and is no more than 20mm, FeSO in the step of matching (1) is added according to contaminated soil quality to be processed4·7H2O solution；
(3) pH size and amount of water, the calcium hydroxide of addition are determined according to the initial pH of contaminated soil to be processed and moisture content
Amount of solution is to ensure that the pH of contaminated soil to be processed is 6, makes the final moisture content 35% of contaminated soil to be processed, amount of water according to
As shown in table 1 below；
The relation list of 1 amount of water of table and soil initial aqueous rate
| Soil initial aqueous rate (%) | Estimate amount of water (wt%) |
| <5 | 30 |
| 5–15 | 20 |
| 15–25 | 10 |
| >25 | 0-10 |
(4) 5-15min of mechanical stirring is sufficiently mixed ferrous sulfate solution with contaminated soil to be processed；
(5) soil natural conserves 1 day after oxidation processes.
Embodiment 1: a kind of arsenic, nickel combined pollution place soil remediation stabilizer, including following component and its proportion: content
For the ferrous sulfate solution, calcium hydroxide solution and water of 5wt%, ferrous sulfate is FeSO in ferrous sulfate solution4·7H2O, arsenic,
The contaminated soil quality to be processed in nickel combined pollution place is 100kg, and ferrous sulfate solution quality is 0.4kg, the hydrogen-oxygen of addition
Changing calcium solution ensures that the pH of contaminated soil to be processed is 7, and the water of addition ensures that soil moisture content is 40%；
Using the processing method of a kind of above-mentioned arsenic, nickel combined pollution place soil remediation stabilizer, this method includes following
Step:
(1) FeSO is prepared4·7H2O content is the ferrous sulfate solution of 5wt%；
(2) contaminated soil to be processed removes large-sized stone and other sundries, really by preliminary broken and screening process
It protects partial size and is no more than 20mm, FeSO in the step of matching (1) is added according to contaminated soil quality to be processed4·7H2O solution；
(3) pH size and amount of water, the calcium hydroxide of addition are determined according to the initial pH of contaminated soil to be processed and moisture content
Amount of solution is to ensure that the pH of contaminated soil to be processed is 7, makes the final moisture content 35% of contaminated soil to be processed, amount of water according to
As shown in table 1 below；
The relation list of 1 amount of water of table and soil initial aqueous rate
| Soil initial aqueous rate (%) | Estimate amount of water (wt%) |
| <5 | 30 |
| 5–15 | 20 |
| 15–25 | 10 |
| >25 | 0-10 |
(4) 5-15min of mechanical stirring is sufficiently mixed ferrous sulfate solution with contaminated soil to be processed；
(5) soil natural conserves 1 day after oxidation processes.
Embodiment 3: a kind of arsenic, nickel combined pollution place soil remediation stabilizer, including following component and its proportion: content
For the ferrous sulfate solution, calcium hydroxide solution and water of 5wt%, ferrous sulfate is FeSO in ferrous sulfate solution4·7H2O, arsenic,
The contaminated soil quality to be processed in nickel combined pollution place is 100kg, and ferrous sulfate solution quality is 0.5kg, the hydrogen-oxygen of addition
Changing calcium solution ensures that the pH of contaminated soil to be processed is 8, and the water of addition ensures that soil moisture content is 45%；
Using the processing method of a kind of above-mentioned arsenic, nickel combined pollution place soil remediation stabilizer, this method includes following
Step:
(1) FeSO is prepared4·7H2O content is the ferrous sulfate solution of 5wt%；
(2) contaminated soil to be processed removes large-sized stone and other sundries, really by preliminary broken and screening process
It protects partial size and is no more than 20mm, FeSO in the step of matching (1) is added according to contaminated soil quality to be processed4·7H2O solution；
(3) pH size and amount of water, the calcium hydroxide of addition are determined according to the initial pH of contaminated soil to be processed and moisture content
Amount of solution is to ensure that the pH of contaminated soil to be processed is 8, makes the final moisture content 35% of contaminated soil to be processed, amount of water according to
As shown in table 1 below；
The relation list of 1 amount of water of table and soil initial aqueous rate
| Soil initial aqueous rate (%) | Estimate amount of water (wt%) |
| <5 | 30 |
| 5–15 | 20 |
| 15–25 | 10 |
| >25 | 0-10 |
(4) 5-15min of mechanical stirring is sufficiently mixed ferrous sulfate solution with contaminated soil to be processed；
(5) soil natural conserves 1 day after oxidation processes.
In order to illustrate the beneficial effect for the treatment of formulations and its processing method of the invention, tested as follows:
Ni contaminated soil: the stability and leaching concentration of heavy metal Ni are mainly controlled by pH, stable under mildly acidic conditions
Property it is poor, leaching concentration is high, neutral or weak basic condition stability inferior is good, leaching concentration is low therefore super for Ni leaching concentration
Target Y1 pedotheque has carried out the research of stabilisation lab scale, and research contents predominantly uses white lime (calcium hydroxide, Ca (OH)2)
The adjusting of soil pH is carried out, the variation of soil Ni leaching concentration is measured.
Table 2 is illustrated using Ca (OH)2The pilot run of stabilization processes Y1 pedotheque.With Ca (OH)2Dosage increases
Add, soil pH gradually rises, and Ni leaching concentration also decreases.As Ca (OH)2When dosage is 0.5%, soil pH is from original
It is alkalescent (pH 7.52) that faintly acid (pH 4.63), which increases, and Ni leaching concentration is 0.009mg/L at this time, is less than 0.02mg/L,
Reach reparation target.Continue growing Ca (OH)2Dosage, soil pH can be further up, and Ni leaching concentration remains to maintain at this time
Lower level illustrates that the leaching concentration of Ni can be controlled easier by improving soil pH.Due to the stability pair of As
PH is more sensitive, the variation of As leaching concentration in our Simultaneous Monitorings soil pH adjustment process.The results show that when soil pH is excessively high
When (> 10.7), As leaching concentration is risen compared with original value.Nevertheless, since the total As content of soil is not high, and in soil
There is preferable fixing effect to As containing a large amount of metal oxide, As leaching concentration is consistently less than 0.03mg/L, does not occur
The exceeded situation of As leaching concentration.
2 Y1 sample of table stabilizes pilot run
As contaminated soil
Since the As leaching concentration of 5 initial soil samples is not exceeded, this research is carried out using simulation As contaminated soil
Stabilize lab scale research.As Polluted Soil is simulated using Y1 soil sample as substrate, pollutant As is artificially added in basad soil sample, through aging
Afterwards up to simulation As contaminated soil.It is 0.217mg/L that the fundamental property of simulation As Polluted Soil, which is shown in Table 3, As leaching concentration, is about repaired
4.3 times of complicated target value (0.05mg/L) need to carry out stabilization processes to it.
The fundamental property list of the simulation As Polluted Soil of table 3
| Analysis project | Analyze result |
| Moisture content (%) | 3.3 |
| pH | 8.44 |
| Total As content (mg/kg) | 235 |
| As leaching concentration (mg/L) | 0.217 |
There is extremely strong affinity to As in view of iron-bearing materials, this investigation and comparison two kinds industrial commonly to contain iron material
Expect (i.e. green vitriol and ferric chloride hexahydrate) to the stabilization effect of As in As contaminated soil.Green vitriol
Dosage with ferric chloride hexahydrate (respectively abbreviation ferrous sulfate and iron chloride) is respectively 0.5%, 1.0%, 1.5%, 2.0%,
2.5%, since ferrous sulfate and iron chloride may cause soil acidification, compounding is added appropriate calcium hydroxide and adjusts soil
PH, concrete medicament dosage are shown in Table 4.
4 ferrous sulfate of table and iron chloride stabilize the experimental condition and processing result of lab scale
Stabilization results (Fig. 1) display, the As of arsenic pollution soil is leached dense after ferrous sulfate and iron chloride stabilization processes
Degree is decreased below the level of 0.05mg/L by initial 0.22mg/L, illustrates that two kinds of iron content medicaments all have preferable stabilization
Change effect, and dosing can be no more than 0.5%.However, (about 300 yuan/ton) of the market price of ferrous sulfate is far below chlorination
Iron (about 3000 yuan/ton), it is seen that there is better economic feasibility as stabilization agent using ferrous sulfate.
There is good stabilization effect and cheap use cost in view of ferrous sulfate, this research is steady with ferrous sulfate
Determine chemical drug agent and further carried out optimization of process conditions and Study on influencing factors, mainly having investigated process conditions includes ferrous sulfate
The influence of dosage, amount of water and pH to stabilization effect, specific experimental condition are shown in Table 5.
The experimental condition and processing result of 5 ferrous sulfate stabilizing treatment technique of table optimization
(1) ferrous sulfate dosage
Ferrous sulfate dosage is to influence the most important factor of stabilization effect.Foregoing study results show 0.5% sulfuric acid Asia
Iron, which compounds 0.3% calcium hydroxide, can make the As leaching concentration of Polluted Soil decrease below the water for repairing target value (0.05mg/L)
It is flat, to further decrease dosing and reagent cost while reaching and repairing target, this research to ferrous sulfate dosage into
Optimization is gone.On the other hand, as shown in Figure 2, when 0.5% ferrous sulfate compounds 0.3% calcium hydroxide in use, soil pH has no
Significant changes (become 8.46 from initial 8.44), and a small amount of ferrous sulfate (< 0.5%) addition can be predicted and make to the acidification of soil
With weaker, therefore, ferrous sulfate can be used alone as stabilization agent, and no longer compounding calcium hydroxide uses.
As shown in figure 3, As leaching concentration increases with ferrous sulfate dosage in 0.1%-0.5% ferrous sulfate amount ranges
Add and gradually decreases.When ferrous sulfate dosage is 0.1%, small variation only occurs for As leaching concentration, is down to from 0.217
0.209mg/L, it is seen that stabilization effect is not achieved when too low in ferrous sulfate dosage.Increase ferrous sulfate dosage to 0.2%, As leaching
Concentration is remarkably decreased to 0.076mg/L out, but is still greater than the reparation target of 0.05mg/L.Further increasing ferrous sulfate dosage is
0.3%, As leaching concentration is 0.034mg/L at this time, is less than 0.05mg/L, reaches reparation target.Ferrous sulfate is reducing As leaching
Out while concentration, the small size decline of soil pH is also brought, is reduced to 7.6 or so from initial 8.4.This and expected results one
It causes, therefore individually there is good feasibility as stabilization agent using ferrous sulfate.Although As leaching concentration is in sulfuric acid Asia
In the range of iron dosage is 0.3% to 0.5% and no significant difference, but in view of there are soil degrees of irregularity in Practical Project
The problems such as big, the appropriate excessive stabilization agent that applies can ensure further stabilization processes under the premise of economic cost allows
Effect.The market price of industrial ferrous sulfate is about 300 yuan/ton, the reagent cost that ferrous sulfate dosage is 0.3% and 0.5%
Respectively 0.9 yuan and 1.5 yuan of soil per ton, far below the conventional cost of domestic and international hundreds of member soil per ton.In conclusion this research
On the basis of taking into account stabilization effect and reagent cost, determine that 0.5% is the optimal value of ferrous sulfate dosage, subsequent technique item
Part research is carried out based on this dosage.
(2) amount of water
Amount of water is another factor for influencing to stabilize implementation and effect.Under normal conditions, too low amount of water is easy to lead
Cause the problems such as stirring is difficult, sample mixing is uneven；And increase amount of water be beneficial to stirring but medicament is sufficiently anti-with soil
It answers, but excessively high amount of water will lead to after processing that soil is excessively dilute is unfavorable for subsequent disposition, it is therefore necessary to stabilization processes
Amount of water optimizes.In addition, the optimal value of amount of water is also closely related with the initial aqueous rate of process object.This research processing
Object is soil after air-drying, and initial aqueous rate is lower (only 3.3%), therefore the amount of water for designing 4 gradients is respectively
20%, 30%, 40%, 50%.This research stirs complexity, soil property and steady under the conditions of different amount of water by comparing
Surely change effect, provide theoretical direction and data foundation for the control of amount of water in Practical Project.
Under the conditions of different amount of water, soil is stabilized, and treated that character is as shown in Figure 4.When 20% amount of water, soil
More difficult stirring, and relatively dry state is still presented in soil after processing；When 30% amount of water, the difficulty of soil stirring is not changed
It is kind, and soil stickiness is very big at this time；When 40% amount of water, soil is easy to stir, and oozes out without excessive moisture；Continue to increase and adds water
When amount is to 50%, flowable shape is presented in soil after processing.Compare the As leaching concentration (figure of contaminated soil after different amount of water are handled
5) it finds, the difference of soil property does not cause As leaching concentration and the significant difference of pH, and wherein As leaching concentration is in 0.028-
Within the scope of 0.035 mg/L, pH fluctuates within the scope of 7.48-7.56.It can be seen that need to be to stir difficulty or ease journey when optimization amount of water
Soil property is main investigation factor after degree and processing.In conclusion being not only conducive to stirring under the conditions of 40% amount of water and handling
Soil will not be excessively dilute afterwards, this amount of water is the optimal value for lab scale soil.It can refer to as shown in the figure 40% in engineering construction to add
The character of soil carries out the selection of amount of water after water processing.
(3) pH influences
Soil pH is the key factor for influencing As stability, studies influence of the soil pH to As stabilization effect to practical behaviour
Result anticipation is carried out in work to be of great significance.This research is added different on the basis of using 0.5% ferrous sulfate as stabilizer
The calcium hydroxide (0%-0.9%) of amount adjusts soil pH, monitors pH the and As leaching concentration of soil after stabilization processes, is sentenced with this
Soil pH break to the stabilized influence of As.As a result (Fig. 5 a) shows to increase with calcium hydroxide dosage, and soil pH and As leaching are dense
There is different degrees of rising in degree.In particular, soil pH is greater than 9.5, As and leaches when calcium hydroxide dosage is greater than 0.5%
Concentration is greater than 0.14mg/L, it is seen that it is exceeded (> 0.05mg/L) that excess calcium hydroxide addition will lead to As leaching concentration.By Fig. 5 b
It is found that positive correlation is presented in soil pH and As leaching concentration, As leaching concentration is increased with soil pH and is gradually increased, it is seen that drop
The stability of As in soil can be improved in low soil pH.Since acceptance of work standard requirements soil pH is between 6-9, it is practical
Soil pH is adjusted in operation to less than 8 neutrality or weak acid environment is beneficial to obtain better As stabilization effect.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Within protection scope of the present invention, therefore, protection scope of the present invention should be based on the protection scope of the described claims lid.
Claims (2)
1. a kind of arsenic, nickel combined pollution place soil remediation stabilizer, it is characterised in that: including following component and its proportion: containing
Amount is ferrous sulfate solution, calcium hydroxide solution and the water of 5 wt%, and ferrous sulfate is FeSO in ferrous sulfate solution4•7H2O, sulphur
Sour ferrous iron solution quality and contaminated soil mass ratio to be processed are 0.3:100-0.5:100, the calcium hydroxide solution amount of addition
To ensure that the pH of contaminated soil to be processed is 6-8, the water of addition ensures that contaminated soil moisture content to be processed is 35-45%.
2. the processing method of a kind of arsenic according to claim 1, nickel combined pollution place soil remediation stabilizer, feature
It is: method includes the following steps:
(1) FeSO is prepared4•7H2O content is the ferrous sulfate solution of 5 wt%；
(2) contaminated soil to be processed removes large-sized stone and other sundries, it is ensured that grain by preliminary broken and screening process
Diameter is no more than 20mm, and FeSO in the step of matching (1) is added according to contaminated soil quality to be processed4•7H2O solution；
(3) pH size and amount of water, the calcium hydroxide solution of addition are determined according to the initial pH of contaminated soil to be processed and moisture content
Amount makes the final moisture content 35-45% of contaminated soil to be processed to ensure that the pH of contaminated soil to be processed is 6-8；
(4) 5-15 min of mechanical stirring, is sufficiently mixed ferrous sulfate solution with contaminated soil to be processed；
(5) soil natural conserves 1 day after oxidation processes.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111704228A (en) * | 2020-06-11 | 2020-09-25 | 湖南恒凯环保科技投资有限公司 | Underground water pollution in-situ reagent preparation and injection device and method |
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| CN112029507A (en) * | 2020-05-07 | 2020-12-04 | 江苏隆昌化工有限公司 | Farmland arsenic-polluted soil remediation material and preparation method thereof |
| CN111704228A (en) * | 2020-06-11 | 2020-09-25 | 湖南恒凯环保科技投资有限公司 | Underground water pollution in-situ reagent preparation and injection device and method |
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| CN113751491B (en) * | 2021-09-07 | 2022-07-26 | 南京大学 | Passivation restoration method for agricultural land arsenic-cadmium composite polluted soil |
| CN114289488A (en) * | 2021-11-23 | 2022-04-08 | 生态环境部南京环境科学研究所 | Ferrous ion activation method for repairing organic contaminated soil |
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